log socket number

src/core/ngx_connection.c

diff --git a/src/core/ngx_connection.c b/src/core/ngx_connection.c
index 87219f2..af2f25c 100644
--- a/src/core/ngx_connection.c
+++ b/src/core/ngx_connection.c
@@ -735,7 +735,7 @@
         /* we use ngx_cycle->log because c->log was in c->pool */
 
         ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_socket_errno,
-                      ngx_close_socket_n " failed");
+                      ngx_close_socket_n " %d failed", fd);
     }
 }